Alert archive / Missouri / Clark County
Weather alerts in Clark County, Missouri, 2011
152 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Clark County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 152
- Warnings
- 57
- Watches
- 24
- Advisories
- 22
- Busiest month
- June68 alerts
- Busiest day
- June 14, 201111 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Clark County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 18 | 12 | 33% | 4 | 100% | 31 min |
| Flash flood warnings | 8 | 5 | 38% | 3 | 100% | 185 min |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Quad Cities, IA: tornado warnings | 15 | 7 | 53% | 14 | 71% | 15 min |
| NWS Quad Cities, IA: severe thunderstorm warnings | 157 | 110 | 30% | 411 | 81% | 27 min |
| NWS Quad Cities, IA: flash flood warnings | 30 | 23 | 23% | 69 | 77% | 164 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 10, 4:17 AM CST | Winter Weather Advisory | DVN | 38 hr |
| Jan 16, 3:50 PM CST | Winter Weather Advisory | DVN | 28 hr |
| Jan 17, 2:50 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 30, 3:40 AM CST | Winter Storm Watch | DVN | 37 hr |
| Jan 31, 4:12 PM CST | Blizzard Warning | DVN | 44 hr |
| Feb 1, 10:36 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 1, 3:36 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 2, 3:38 PM CST | Wind Chill Advisory | DVN | 19 hr |
| Feb 7, 3:31 PM CST | Wind Chill Advisory | DVN | 20 hr |
| Feb 16, 5:00 AM CST | Dense Fog Advisory | DVN | 8 hr |
| Feb 17, 10:56 AM CST | River Flood Warning | DVN | 10 hr |
| Feb 18, 1:12 AM CST | River Flood Warning | DVN | 10 hr |
| Feb 24, 3:20 AM CST | Winter Storm Warning | DVN | 17 hr |
| Feb 24, 3:20 AM CST | Winter Weather Advisory | DVN | 26 hr |
| Feb 24, 5:20 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 27, 3:37 PM CST | Winter Weather Advisory | DVN | 11 hr |
| Mar 22, 8:00 PM CDT | Mesoscale Discussion | SPC | 60 min |
| Mar 22, 10:19 PM CDT | Special Weather Statement | DVN | 56 min |
| Mar 22, 11:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 29, 11:38 AM CDT | River Flood Warning | DVN | 45 days |
| Apr 3, 5:57 PM CDT | Tornado Watch | SPC | 6 hr |
| Apr 3, 7:44 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Apr 3, 9:36 PM CDT | Severe Thunderstorm Warning | DVN | 38 min |
| Apr 10, 3:55 AM CDT | Wind Advisory | DVN | 12 hr |
| Apr 10, 5:03 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Apr 10, 6:05 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 14, 12:00 PM CDT | River Flood Warning | DVN | 21 days |
| Apr 15, 2:21 PM CDT | Special Weather Statement | DVN | 84 min |
| Apr 19, 2:53 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Apr 19, 5:21 AM CDT | Special Weather Statement | DVN | 114 min |
| Apr 19, 5:52 AM CDT | Mesoscale Discussion | SPC | 83 min |
| May 2, 3:33 PM CDT | Frost Advisory | DVN | 15 hr |
| May 3, 3:15 PM CDT | Freeze Warning | DVN | 16 hr |
| May 11, 12:03 PM CDT | Special Weather Statement | DVN | 57 min |
| May 11, 12:51 PM CDT | Severe Thunderstorm Warning | DVN | 24 min |
| May 11, 3:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 4:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 10:53 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 12:51 PM CDT | Tornado Watch | SPC | 10 hr |
| May 25, 12:48 AM CDT | Mesoscale Discussion | SPC | 57 min |
| May 25, 1:22 AM CDT | Tornado Watch | SPC | 7 hr |
| May 25, 2:20 AM CDT | Special Weather Statement | DVN | 70 min |
| May 25, 2:38 AM CDT | Flash Flood Watch | DVN | 20 hr |
| May 25, 6:37 AM CDT | River Flood Warning | DVN | 52 hr |
| May 25, 11:46 AM CDT | River Flood Warning | DVN | 13 days |
| May 25, 2:31 PM CDT | Tornado Watch | SPC | 7 hr |
| May 25, 3:34 PM CDT | Severe Thunderstorm Warning | DVN | 56 min |
| May 25, 4:33 PM CDT | Flash Flood Warning | DVN | 3 hr |
| May 26, 5:55 AM CDT | River Flood Warning | DVN | 39 hr |
| May 26, 10:52 AM CDT | River Flood Warning | DVN | 24 hr |
| May 28, 12:15 PM CDT | Mesoscale Discussion | SPC | 90 min |
| May 29, 1:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 29, 8:39 AM CDT | Mesoscale Discussion | SPC | 66 min |
| May 29, 8:53 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 29, 9:55 AM CDT | Severe Thunderstorm Warning | DVN | 65 min |
| May 29, 3:06 PM CDT | River Flood Warning | DVN | 38 hr |
| May 31, 6:10 AM CDT | Special Weather Statement | DVN | 35 min |
| Jun 2, 7:16 AM CDT | Flash Flood Warning | DVN | 6 hr |
| Jun 2, 2:08 PM CDT | River Flood Warning | DVN | 20 hr |
| Jun 2, 10:52 PM CDT | River Flood Warning | DVN | 31 hr |
| Jun 4, 4:20 PM CDT | Severe Thunderstorm Warning | DVN | 55 min |
| Jun 4, 4:47 PM CDT | Mesoscale Discussion | SPC | 28 min |
| Jun 4, 4:53 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 4, 5:14 PM CDT | Severe Thunderstorm Warning | DVN | 61 min |
| Jun 5, 2:25 AM CDT | Special Weather Statement | DVN | 50 min |
| Jun 5, 2:52 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 3:03 AM CDT | Severe Thunderstorm Warning | DVN | 57 min |
| Jun 5, 3:31 AM CDT | Severe Thunderstorm Warning | DVN | 59 min |
| Jun 5, 5:00 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 6, 3:28 AM CDT | Heat Advisory | DVN | 64 hr |
| Jun 9, 3:12 AM CDT | Flash Flood Watch | DVN | 28 hr |
| Jun 9, 4:29 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 9, 9:48 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 9, 10:58 PM CDT | Special Weather Statement | DVN | 107 min |
| Jun 9, 11:13 PM CDT | Flash Flood Warning | DVN | 6 hr |
| Jun 9, 11:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 10, 4:51 PM CDT | Severe Thunderstorm Warning | DVN | 39 min |
| Jun 10, 5:29 PM CDT | Severe Thunderstorm Warning | DVN | 61 min |
| Jun 10, 9:35 PM CDT | River Flood Warning | DVN | 23 hr |
| Jun 11, 5:18 PM CDT | River Flood Warning | DVN | 11 days |
| Jun 13, 1:05 PM CDT | Special Weather Statement | DVN | 55 min |
| Jun 13, 1:46 PM CDT | Special Weather Statement | DVN | 59 min |
| Jun 13, 3:47 PM CDT | Flash Flood Watch | DVN | 39 hr |
| Jun 13, 9:10 PM CDT | Severe Thunderstorm Warning | DVN | 50 min |
| Jun 13, 9:21 PM CDT | Flash Flood Warning | DVN | 8 hr |
| Jun 13, 9:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 13, 11:48 PM CDT | River Flood Warning | DVN | 70 hr |
| Jun 13, 11:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 14, 2:15 AM CDT | River Flood Warning | DVN | 4 days |
| Jun 14, 3:21 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 14, 5:20 AM CDT | Areal Flood Warning | DVN | 12 hr |
| Jun 14, 8:21 AM CDT | River Flood Warning | DVN | 3 days |
| Jun 14, 2:56 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 14, 4:07 PM CDT | Areal Flood Warning | DVN | 12 hr |
| Jun 14, 10:11 PM CDT | Flash Flood Warning | DVN | 8 hr |
| Jun 15, 1:55 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 15, 6:27 AM CDT | Areal Flood Warning | DVN | 12 hr |
| Jun 18, 5:57 AM CDT | Special Weather Statement | DVN | 78 min |
| Jun 18, 9:43 AM CDT | Flash Flood Warning | DVN | 2 hr |
| Jun 19, 5:14 AM CDT | Special Weather Statement | DVN | 2 hr |
| Jun 19, 10:17 PM CDT | Flash Flood Watch | DVN | 15 hr |
| Jun 19, 11:41 PM CDT | Severe Thunderstorm Warning | DVN | 49 min |
| Jun 19, 11:42 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 20, 1:45 AM CDT | Severe Thunderstorm Warning | DVN | 75 min |
| Jun 20, 4:08 AM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 20, 8:55 AM CDT | Flash Flood Warning | DVN | 4 hr |
| Jun 20, 9:26 AM CDT | River Flood Warning | DVN | 43 hr |
| Jun 20, 1:02 PM CDT | Areal Flood Warning | DVN | 6 hr |
| Jun 20, 1:58 PM CDT | River Flood Warning | DVN | 62 hr |
| Jun 20, 3:25 PM CDT | Flash Flood Watch | DVN | 12 hr |
| Jun 26, 4:46 PM CDT | Flash Flood Watch | DVN | 14 hr |
| Jun 26, 6:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 26, 6:29 PM CDT | Special Weather Statement | DVN | 61 min |
| Jun 26, 7:01 PM CDT | Severe Thunderstorm Warning | DVN | 59 min |
| Jun 26, 7:12 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 26, 7:53 PM CDT | Severe Thunderstorm Warning | DVN | 67 min |
| Jun 26, 8:14 PM CDT | Flash Flood Warning | DVN | 9 hr |
| Jun 26, 8:31 PM CDT | Severe Thunderstorm Warning | DVN | 59 min |
| Jun 26, 10:02 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 26, 10:16 PM CDT | River Flood Warning | DVN | 3 days |
| Jun 26, 10:16 PM CDT | River Flood Warning | DVN | 4 days |
| Jun 27, 12:31 AM CDT | River Flood Warning | DVN | 68 hr |
| Jun 27, 1:02 AM CDT | Severe Thunderstorm Warning | DVN | 58 min |
| Jun 29, 3:18 PM CDT | Excessive Heat Watch | DVN | 13 hr |
| Jun 30, 3:55 AM CDT | Heat Advisory | DVN | 44 hr |
| Jul 10, 1:58 PM CDT | Heat Advisory | DVN | 5 hr |
| Jul 11, 3:12 AM CDT | Heat Advisory | DVN | 16 hr |
| Jul 12, 1:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 14, 3:40 PM CDT | Excessive Heat Watch | DVN | 24 hr |
| Jul 15, 3:42 PM CDT | Excessive Heat Warning | DVN | 9 days |
| Jul 21, 7:09 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 23, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 26, 10:53 AM CDT | Heat Advisory | DVN | 10 hr |
| Jul 27, 3:44 AM CDT | Heat Advisory | DVN | 18 hr |
| Jul 28, 12:03 PM CDT | Heat Advisory | DVN | 10 hr |
| Jul 28, 5:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 29, 4:14 AM CDT | Special Weather Statement | DVN | 61 min |
| Jul 31, 3:54 AM CDT | Heat Advisory | DVN | 66 hr |
| Aug 2, 3:50 AM CDT | Excessive Heat Warning | DVN | 18 hr |
| Aug 6, 10:14 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 6, 11:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 7, 12:20 AM CDT | Severe Thunderstorm Warning | DVN | 55 min |
| Aug 8, 6:21 AM CDT | Special Weather Statement | DVN | 24 min |
| Aug 17, 3:44 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 24, 3:55 AM CDT | Heat Advisory | DVN | 12 hr |
| Sep 1, 10:40 AM CDT | Heat Advisory | DVN | 32 hr |
| Oct 1, 2:47 PM CDT | Frost Advisory | DVN | 17 hr |
| Oct 20, 3:20 AM CDT | Freeze Warning | DVN | 30 hr |
| Oct 25, 6:56 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Nov 23, 4:53 AM CST | Dense Fog Advisory | DVN | 7 hr |
| Dec 6, 7:45 AM CST | Winter Weather Advisory | DVN | 6 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 18 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 34 |
| Special Weather Statement | 15 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 8 |
| River Flood Warning | 21 |
| Flash Flood Watch | 6 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 5 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 2 |
| Heat Advisory | 10 |
| Cold | |
| Freeze Warning | 2 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.